JingCai DVD(ZORAN36962) problem

i bought a chinese dvd player with divx playback, after a month it gave me a strange problem. it only plyed every cd/dvd for five minutes and then stoped plying disc showing a message" unsupported format" i checked the circuit ,the main sunplus ic was so heated.i replace the board with JingCai DVD(ZORAN36962) board but now the picture is very soft as compare to its origional borad playback. i wonder if i can use any kind of shrpness enhancement circui for this and if such things do exist.guide me.